Boring machine



43 Sheets-Sheet' l un um IIIHI Il l 5 i Mllnifinu pr. l?, 923.

JIIIIIII Apr. 17, 1923.

E. s. TOWNS BORING MACHINE Filed Juls 19 1921 3 Sheets-Sheet 2 1,452,0@7 E. S. TOWNS BORING MACHINE Filed July 19. .1921 3 Shee'lzs-Sheeil 3 Patented rger. i?, i923.

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EUGENE S. TOWNS, Ol AUSTN, TEXAS.

BORING MACHINE.

Application filed July 19, .1.921.

To all whom t may conceit/t;

Be it known that L'EricnNn S. Towns, a citizen ofthe United States of America, and residentfof Austin, in the countyot Travis and State of Texas, have invented certain new and useful lmprovements in Boring Machines, of which the following is a specification This yinvention relates to metal working machines, and particularly to a machine adapted for use in dressing cylinders of internal combustion niotors withoutv removing the block 'ory cylinder from the crank case; the said inventionbeing eliective to operate in conjunction with cylinders by the simple removal of thecylinder heads, the pistons and connecting rods of two adjacent or adjoining eylinders, means being provided for anchoring the machine in one of the cylinders whereby it may be held in operative relation to thecylinder to be dressed.

A still further object of this invention is to provide novel means for holding the tool carrying element in rotatable relation to the cylinder wall, and the provision of novel means whereby the tool may be fed longi tudinally of the cylinder while being'rotaited; the said invention furthermore contemplating the provision of means for centering the tool with relation to the cylinder wall by means which can be readily applied to or. removed from its operative position with relation to the said cylinders.

W'ith the foregoing and other objects in view, the inventionconsists in the details of construction, andin the arrangement and combination otparts to be hereinafter more fully set forth and claimed."

ln describing the invention in detail, reference will be had to the accompanying drawings forming part'of this application, wherein like characters denote corresponding parts in the several views, and in which- VFigure 1 illustrates a view in elevation ot a `machine embodying the invention;

Figure 2 illustrates a view in elevation ot the tool and its mounting;

Figure 3 illustrates a plan view partly in section of the cutter drive;

Figure 4 illustrates a plan view ot a cutter mounting;`

Figure 5 illustrates a top plan view of the frame of the device andthe parts associated therewith;

Serial No. 485,837.

Figure 6 illustrates a sectional view Qt the tool mounting; l A 4 l Figure Z illustrates a detail view of the means Jfor adjusting the tool mounting 4with relation to the anchoring device l Figure S illustrates a detail view of the tool mounting support; V Y Y ilfigure 9 illustrates a plan view thereof.

Figure illustrates a side view of a slide block for the lower centering pin of the tool mounting; and

ltigure'll is a side elevation of the upper centering pin. l V

ln these drawings 10 denotes the head frame having suitable bearings for a shaft 11 of a gear wheel l2, and a bearing 13 for a shaft 14 carrying 4a pinion 15 which meshes with the gear wheel'1`2, thesaid shaftlbeing designed as the ldrive shaft to receive power from a crank handle or power transmitting means such as a belt or sprocket chain. As the means for applying power to the drive shaft 14 is an immaterial detail, it need not,lit is thought, be shown specifi cally. y

y The shaft 11 has a toothed wheel 16 on its lower end which meshes with the teeth of the wheel 17 which is vformed with or connected to the tool mounting 18. The tool mounting is preferably of cylindrical construction having a seat 19 at its upper end and a seat 20 at its lower end to torni bearings, and this tool mounting may hetermed a boring bar in that it is rotatably mounted and carries the tool, willpresently appear. The head frame has a depending spindle 21 of conical shape fitted in ,the seat 19 formed in the upper'end of the tool mounting. The spindle is threaded in the head frame and the conical configuration of its lower end serves to properly center the tool mounting. The gear 16 is 'wider than the gear 17, a condition which permits a limited vertical adjustment of the tool carrier while maintaining the engagement of these gear wheels which are provided for communicating the power from the drive shaft through the train of gearing to the tool mounting.

A head stock 22 has slotted arm 2? to receive an anchoring element 24 in the uaw ture of a screw or the like, attached to the head frame, and by this arrangement. the head stock may be moved toward or away from the head frame, and these parts may be held in proper spaced relation to each other by the fastenind 24, in order vthat the head stock'may be placed in a cylinder and anchored, as will presently appear, to retain the cutter mounting centered lwith relation to the adjacent cylinder which is to be treated. A tail stock is intended to coact with the head stock 22, the'head stock 22 being intended to enter the cylinder at the top, and the tail stock being intended to enter the cylinder at the bottom. The head stock has a stud 26 threaded in it, and this stud extends through the tail stock, its lower end being threaded, as shown at 27 to engage a nut 2S by which the head and tail stocks are clamped in the cylinder. The said head and tail stocks are conical to facilitate the centering of these elements with relation to the cylinder to which they are applied.

rlhe tail stock 25 has a slotted arm 29 in which a seat 30 is adjustably secured by the nut 3l. The seat is intended to support the lower spindle 32 which projects into the seat 20 of the tool mounting 18, in order that the tool mounting may be free to rotate under the influence of the driving mechanism heretofore described.

As stated, the tool mounting` 18 is of cylindrical construction and it has a recess 33 in one side extending practically throughout its length, in which a screw 34 is rotatably mounted by reason of the fact that said screw has a bearing at its lower end in the end of the tool mounting, as shown at 85. The screw is also journaled at its upper end through the head of the tool mounting, as shown at 36, and a star wheel 37 is secured to the said screw. The screw 84 is, of course, a feed screw and it is intended to move the tool as the cutting` action progresses. In this embodiment of the invention, the cutter 38 is carried by a ring 39 which encircles the cylindrical member, the said ring having a web 4L() extending` into the recess 33. The web is apertured, as shown at 41, and its walls are engaged by the screw 34e so that as the screw is rotated, the ring 39 will be moved longitudinally of the cylinder to feed the tool during its cutting operation.

As furthermore shown in this embodiment of the invention, the slidable tool carrier is providedwith a seat for a set screw 43 which has a conical end for engagement with the beveled end of the cutter 88, and a seat for a set screw 45 that clamps the cutter in place, and it may be noted that the internally threaded apertures intersect the opening in which the cutter is seated, and that the inward extending portion of the cutter carrier by engagement with the longitudinal walls of the recess in the tool carrier prevents rotation of the slidable tool carrier and provides a housing` for the screw 34e.

The star wheel is caused to engage a trip `i4 as it is carried around with the tool mounting, and it is moved the distance of one tooth of the said star wheel at each rotation of the tool mounting, although the feeding operation could be increased Yby adding trips to operate the star wheel more frequently, but that is a condition which those skilled in the art will understand without further illustration of the same.

lt will be apparent from the description and illustration that the head and tail stocks may be readily applied to a cylinder, and that the tool supporting trunnions or spindles may be adjusted with relation to the head and tail stocks, and the manner of driving the mechanism or operating it, will be understood from the fact that a description ot the function and operation of the parts and their relation to one another has been stated in connection with a description of the elements comprising the present embodiment of the invention.

The boring tool hereinbefore described is particularly adapted for use in reboring cylinders 'of internal combustion engines, and with such engines the pistons do not have a stroke equal to the entire length of the cylinders, consequently the cylinders are true at their ends, and by using a pair 'of cylinder engaging members with conical portions the head and tail stocks adjust or aline themselves when clamped in `position for use. The length of the tool mounting is such relative to the head stock that the cutter carrier may be` moved beyond the conical portion of the head stock andy entirely beyond the cylinder to be trued, and provision is made for a lateral adjustment of the tool mounting and the lcutting tool.

l claim:

l. In a machine for boring cylinders, a pair of conical heads which are adapted to be positively connected and held in engage-` ment with opposite ends of a cylinder, laterally extending members carried by the heads, laterally adjustable center pin carriers maintained by the laterally extending members of the heads, a tool. mounting vengaged by pins which are supported by the pin carriers, and means for rotatingthe tool mounting associated with one of the heads. i

2. A boring machine comprising apair of head stocks each-having conical portions for engagement with the end portions of a cylinder, centrally located means for clamping the head stocks in positive engagement with a cylinder, lateral extending members intelgral with their respective heads, laterally adjustable centering pins maintained by the laterally extending members, a tool mounting maintained by the pins and provided with a gear, driving means associated with one of the head stocks for engagement with the gear on the tool mounting, and a cutting tool slidably associated with the tool mounting.

llO

1n a boring tool a pair o conical cylinder end engaging members, means for connecting said members and clamping them in positive engagement With the opposite ends A ot' a cylinder, laterally projecting members having slots therethrough said members being integral with the aforesaid cylinder end engaging members, a frame adjustably secured to one of the slotted members, a centering point carried by the frame, a train of gears operatively associated with the fra-me, a tappet that projects from the traine, a tool mounting provided with a gear which is driven to rotate the toolv mounting, a feed screw carried by the tool mounting and provided with a star Wheel that engages the tappet during the rotation of the tool mounting, a centering pin in adjustable engagement with the opposite end of the tool mounting and a traveling cutter carrying ring asso ciated With the tool mounting and its feed screw.

4. ln a. tool for boring cylinders, a pair of cylinder engaging members each having conical portions for engagement simultaneously With opposite ends of a cylinder, one oi the heads being of greater length than the other, a centrally located bolt for connecting the heads, means associated with the heads i'or maintaining a tool mounting in position to operate within an adjacent cylinder, a cutter carrying frame on the tool mounting such frame being movable on the tool mounting beyond the end of the cylinders.

EUGENE TOWNS.

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